Oil-burning furnace.



H. V. LEAHY.

OIL BURNING FURNACE. APPLICATION FILED AUG. 28, 1911.

1,065,057., Patented June 17,1913.

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H. V. LEAHY.

OIL BURNING FURNACE.

APPLICATION FILED AUG. 28, 1911.

1,065,057, Patented June'1'7, 1913.

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s'rArrs OIL-BURNING FURNACE.

f0 all whom it may concern:

Be it known that I, HERBERT V. LEAI-IY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Oil-Burning Furnace, of which the following is a specification. I

This invention relates to furnaces for burning liquid fuel such as crude 011 or petroleum, and the main object of the invention is to provide a furnace of simple construction in which the metallic parts of the burner are protected from the heat of the flame.

Another object of the invention is to provide an oil burning furnace in which the burner .is located out of the combustion chamber at the rear thereof and the flame is projected forwardly therefrom into the combustion chamber.

A further object of the invention is to provide an oil burning furnace with simple and effective means for heating and distributing the air furnished for combustion and in this connection a particular object of the invent-ion is to provide for supplying air to the place of combustion at a relatively low velocity so that the flame and hot gases will be retained for considerable time in contact with or in heating relation to the combustion chamber and the boiler or other means heated thereby, thereby utilizing the heat of the flame and hot products of combustion to the greatest possible extent.

Another object of the invention is to provide in an oil burning furnace of this type, means for convenient insertion of the burner head.

Another object of the invention is to lengthen the life of the boiler or other means heated by the furnace by producing an even flame under the boiler.

Another object of the invention is to prevent carbonizing of the oil in the burner and pipes and prevent the burner from clogging.

Another object of the invention is to provide for complete control of the air supply and for control of such air supply so as to prevent undue heating of any part of the furnace or any of the burners where a number of burners are used, and to prevent excess of air from passing over and around any of the burners.

A further object of the invention is to provide a furnace of high eliiciency at a Specification of Letters Patent.

Application filed August 28, 1911.

moderate cost.

Patented. June 1'7, 1913.

Serial No. 646,535;

Other objects of the invention will appear, hereinafter.

The accompanying drawings illustrate an embodiment of the invention, and referring thereto: Figure 1 is a longitudinal ver tical section of the furnace. Fig. 2 is a transverse section thereof on line 00 -m in Fig. 1. Fig. 3 is a horizontal section of the furnace on line m a2 in Fig. 2.

The furnace comprises a combustion chamber 1, formed with a front wall 2, rear wall 3 and floor 4, all built of or lined with suitable refractory material such as fire brick, and located adjacent to the means to be heated, for example, a boiler, indicated at 5, extending above the combustion chamber. A fire door 6 is provided in the front wall 2 for access to the combustion chamber, said door having an opening 6. The burner head 7 is located in the rear wall of the furnace and directed so as to project the jet or flame forwardly toward the front of the furnace, so that the operation of the flame may be inspected through the fire door, and

the flame and hot products pass forwardly and then upwardly between the boiler tubes. This rear burning construction has the advantage that the flame is projected toward the front part of the combustion chamber, which in boiler furnaces is generally higher or of greater dimensions, the boiler tubes inclining downwardly so that they are not liable to be burned or damaged by the forwardly projecting flame. The bed or base of the furnace is constructed with a metal frame work 11 upon which rest two layers of brick forming the floor l.

By the construction of the frame work which carries the double layer of bricks it is impossible for any air to leak up through this solid floor and get ahead of the flames. It is possible to make repairs to the boiler, etc., without any danger of cracking or destroying the floor of the furnace as would be the case with a furnace made with only a single layer of brick.

The burner head 7 is formed with a shank 8 extending at right angles to the two supply pipes 9 and 10 for steam and oil, said supply pipes being of sufficient length to extend from the rear wall of the combustion chamber to the outside of the furnace at the front thereof. The said pipes 9 and 10 rest on and are supported by U-shaped brackets 13 depending from cross bars let extending over the top of the longitudinal passages 15 formed in the brick base 4 below the floor 4, these passages 15 serving to receive the burner supply pipes, said passages also serving as air trunks and communicating at their rear ends with a cross channel or air distributing chamber 1?. Rails 12 may connect and brace the cross bars 14. In general, there will be mole than one burner in the furnace and a longitudi nail channel or air passage 15 will be provided for eachburner, all of said passages communicating at their rear ends with the air distributing chamber 17 which extends across from one side wall of the furnace to the opposite side wall, g-t grate 120 extends above the air chamber 17, said grate being of metal and preferably protected from the direct heat of the combustion chamber by fire brick 21 arranged in the manner of checker work, so as to form openings 21 above the grate through which air may pass from the air chamber 17 to the combustion chamber 1. The bed or base of the furnace with the passages therein is preferably constructed with brick walls filled in with earth or debris to within one brick thickness of floor line, thus giving a furnace construction of moderate cost. At the opposite side of the grate bars from the burner 21. line of brick 30 is run extending above the floor of the furnace one brick thickness, this being used for preventing the material accumulating on the furnace floor 4t from passing onto and clogging up the grate and checker work.

The rear wall 3 of the combustion OllfllIl: her, which may constitute a bridge wall in case of a boiler or similar furnace, is formed with vertical channels 23 communicating at their lower ends by passages 2a with the air chamber 17, and communicating at their upper portions by passages or openings 25 with the combustion chamber 1. The guide rails 12, and oil supply pipes extend into and through the lower passage 2% aforesaid, and the burner when in normal position is so placed that its shank 3 extends upwardly from the pipes 9 and 10 within the vertical passage 23, and with said shank resting against a projecting wall portion 23 of the rear wall, this wall portion serving as a stop against which the shank is turned in assembling the burner. When in this position the burner head 7 is opposite the opening 25 in the rear wall so that the jet from the burner may be projected into the com bustion chamber. Piers or walls extend forwardly from the rear wall or bridge wall, between the openings 25, these piers resting on grate 20 and extending far enough to enable independent operation of the burners, but not far enough to interfere with the spread of the fan shaped flames from the burners,

The forward ends of the oil and steam pipes 9 and 10 project outwardly through the front wall of the furnace and are provided with the usual regulating valves 28, 29, 30, 31 and 32 for controlling the admission of oil and steam to the burner.

The burner may be of any usual construction being preferably of the type in which oil is injected through a nozzle or head by the action of a steam jet, and the shank 8 is provided with the usual means for conveying the oil and steam from the pipes 9 and 10 to the burner head in the usual manner.

In inserting the burner in the furnace, the burner head with the pipes 9 and 10 attached thereto is placed in the longitudinal passage in position shown in dotted lines at t e ight han ion of ig.- 2 an Pu h back until it comes to the bottom of the vercel c am r or ha nel 2 in th rear wall 3. The entire burner is then turned at right angles, bringing the burner shank 8 against the wall oortion 23 and the attachments are then made to the outer end of the pipes 9 and 10, holding the parts in stated position.

The operation is as follows: The furnace is started in operation by insertinglighted waste or any other combustible material in front of burners, This is accomplished by means of the small opening 6 in door .6 at front of furnace. The steam and oil valves respectiyely 1116 opened slightly and when the oil is ignited the flame can be adjusted to any width desired, The steam being supplied through pipe 9 and oil through pipe 10 of the respectiye steam and oil valves, the jet of atomized oil is forced by the steam from the burner head and burners within the combustion chamber 1 to form a flame directed forwardly toward the front of the furnace and below the boiler, Intense heat is thus produced within the combustion chamber, but the burner and its supply pipes are protected by their inclosure within the rear wall and floor of the furnace. The air for maintaining combustion enters through the regulating doors or dampers and passing rearw rdly through the longitudinal passages 15 enters the cross passage or air chamber 17 in more or less heated condition .due to the absorption of heat from the hot base a and floor a. On reaching the air chamber 17. the several currents of air from the longitudinal passages are merged into a comparatively large volume of air and the cross section of air chamber 17 in a horizontal plane is greater than the in the checker work in comparatively slow currents of warm air, giving an even uniform combustion which maintains approxi mately uniform temperature throughout the combustion chamber without excessive temperature at any one point, and maintains the hot products of combustion for a sufficient time in contact with the boiler to enable them to give their full heating efiect.

WVith the construction above described, the burner having the hot-test flame will naturally draw more air than the burner which is cut down to a smaller flame. It is possible when using three burners in one of these furnaces to fire the middle burner without any excess of air passing to the combustion chamber through the two outside burners, this being accomplished by shutting the doors that lead to the burner passages which are out of service, as the air coming through the middle passage will naturally feed the flames directly over it. By this construction it will be seen that it is impossible to damage the burners which are out of service as they are entirely out of the furnace and protected in their brick housings. The burners which are in operation are protected by their housings, and the air passing up through channel 23 keeps the burner and the channel cool.

hat I claim is:

1. An oil burning furnace comprising a combustion chamber having its fioor provided with a longitudinal passage and having its rear wall formed with an upright channel with a horizontal passage at the bottom of said upright channel communicating with said longitudinal passage and with an opening at the top of said upright channel communicating with the combustion chamber, and an oil burner comprising supply piping extending longitudinally in said passage in the floor of the chamber, and a shank extending at right angles to said piping, upwardly within said vertical channel in the rear wall of the chamber, and a burner head at the upper end of said shank opposite the opening between said vertical channel and combustion chamber the rear wall of the chamber extending in front of said shank when in upright position.

2. An oil burning furnace comprising a combustion chamber having its floor provided with a longitudinal passage and having its rear wall formed with an upright channel with a horizontal passage at the bottom of said upright channel communicating with said longitudinal passage and with an opening at the top of said upright channel communicating with the combustion chamber, and an oil burner comprising supply piping extending longitudinally in said passage in the floor of the chamber, said supply pipe being provided with a shank extending within said vertical channel in the rear wall of the chamber, and a burner head at the upper end of said shank opposite the opening between said vertical channel and combustion chamber, and supports mounted in said longitudinal channel in the base of the combustion chamber, said piping resting on said supports and being rotatable thereon to enable the burner shank to be in serted flatwise through the passage and then turned up into the upright channel, and stop means on said rear wall to limit the turning movement of said shank, the rear wall of the chamber extending in front of said shank when in upright position.

8. An oil burning furnace comprising front, side and rear walls forming a combustion chamber, a base extending beneath said combustion chamber and provided. with a plurality of longitudinal passages, an air distributing chamber extending across the rear ends of said passages and communicating with all of said passages, a grate extending over said air chamber, a refractory covering for said grate having perforations for passage of air, and a burner in the rear wall of the furnace, the supply pipe for said burner extending longitudinally of each of said longitudinal passages and a shank connected to each supply pipe and to the burner and extending transversely to the supply pipe, said wall having an opening in front of sald burner, the rear wall of the chamber extending in front of said shank when in upright position.

4. An oil burning furnace comprising a base and walls forming a combustion chamber, said base having longitudinal passages extending beneath said combustion chamber and formed with an air distributing chamber at the rear of said passages and connecting with all of said passages, a grate above said air distributing chamber and burners in the rear wall of the combustion chamber corresponding in position to the respective passages, said rear walls having vertical channels connecting with said air distributing chamber and with openings from said channels into the combustion chamber, the burners being located back of said openings and supply means for the burners extending through the longitudinal passages and up wardly within said vertical channels.

In testimony whereof, i have hereunto set my hand at Los Angeles California this 15th day of August 1911.

HERBERT V. LEAHY.

In presence of ARTHUR P. KNIGHT, GLADYs RUSSELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

